==== tests/cases/conformance/types/members/duplicateStringIndexers.ts (6 errors) ====
    // it is an error to have duplicate index signatures of the same kind in a type
    
    module test {
        interface Number {
            [x: string]: string;
            [x: string]: string;
            ~~~~~~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
        }
    
        interface String {
            [x: string]: string;
            [x: string]: string;
            ~~~~~~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
        }
    
        interface Array<T> {
            [x: string]: T;
            [x: string]: T;
            ~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
        }
    
        class C {
            [x: string]: string;
            [x: string]: string;
            ~~~~~~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
        }
    
        interface I {
            [x: string]: string;
            [x: string]: string;
            ~~~~~~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
        }
    
        var a: {
            [x: string]: string;
            [x: string]: string;
            ~~~~~~~~~~~~~~~~~~~~
!!! Duplicate string index signature.
        }
    }